Corrections to "null check" benchmark at http://fasterjava.blogspot.ru/2013/09/the-cost-of-null-check.html

Null2OptimisationsNull.java

/*
 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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package org.openjdk.jmh.samples;

import org.openjdk.jmh.annotations.GenerateMicroBenchmark;
import org.openjdk.jmh.annotations.OperationsPerInvocation;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;

@State(Scope.Thread)
/**
 * {@code java -ea -jar target/microbenchmarks.jar -tu us ".*Null2OptimisationsNull.*"}
 */
public class Null2OptimisationsNull {

    int output = 0;

    private Operations ops = new Operations();

    @GenerateMicroBenchmark
    public int testNullPresent() {
        int output = this.output;
        output = doTest(output, null);
        output = doTest(output, ops);

        return output;
    }

    @GenerateMicroBenchmark
    public int testNullNull() {
        int output = this.output;

        output = doTest(output, null);
        output = doTest(output, null);

        return output;
    }

    @GenerateMicroBenchmark
    public int testPresentPresent() {
        int output = this.output;

        output = doTest(output, ops);
        output = doTest(output, ops);

        return output;
    }

    private int doTest(int input, Operations o) {
        int output = input;
        if (o != null) {
            output = o.op1(output);
        } else {
            output = ops.op2(output);
        }
        return output;
    }
}